Mysid shrimp

The work of a curious fellow
   
We started out calling these animals broke back shrimp then, mistakenly, sand shrimp, quite another critter altogether. Now we have given up trying to classify them and are just calling them swimming shrimp. Finally I settled on mysid shrimp for these animals found at all depths and pretty much everywhere near the bottom.
Mysid shrimp
Mysid shrimp